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20.cough, histamines
1.
2. Cough:
Protective reflex caused by stimulation of sensory nerves
in the mucosa of pharynx, larynx, trachea, bronchi induced
by infections, stimulus like smoke, dust etc.
Productive : Associated with sputum.
Nonproductive : Dry cough-No sputum.
Purpose : To expel respiratory secretions.
3. 1. Pharyngeal Demulcents :
Glycerine and liquorice.
Drugs used for cough:
2. Expectorants (Bronchial secretion enhancers ) :
Sodium citrate, potassium citrate, potassium iodide,
Guaiphenesin, vasaka, ammonium chloride
6. Mucolytics
Break thick tenacious sputum
Lower sputum viscosity
Induce thin copious secretion
sputum comes out easily with less effort
Used in productive cough in chronic bronchitis
7. Antitussives/ Cough suppressants
In brain - raise the threshold of cough center,
↓cough reflex, suppress cough center in medulla.
In respiratory tract - reduces the tussal impulses.
Used in Dry unproductive cough, cough in allergic states
Severe productive cough – disturb sleep, in hernia/ piles/
cardiac disease/ocular surgery
8. Histamine :
A chemical present in mast cells, skin, gastric,
intestinal mucosa, lungs etc.